title: Long-term subjective outcomes of computer-assisted total knee arthroplasty.
abstract: OBJECTIVE
  This study aimed to clarify the results of computer-assisted total knee arthroplasty (TKA) after ten years using patient-derived scores.
  
  
  METHODS
  Thirty posterior-stabilised total knee prostheses implanted using a computed tomography-free navigation system were compared with 30 matched total knee prostheses of the same type implanted using a conventional, manual technique. At an average of ten years after surgery, we investigated patient-reported outcomes using the Knee Society's new scoring system. The results of 27 patients (14 patients in the navigation group and 13 patients in the manual group) were assessed in this study.
  
  
  RESULTS
  There was no significant difference between the navigation and manual groups for any section of the questionnaire, which consisted of symptoms, patient satisfaction, patient expectation, walking/standing, standard activities, advanced activities, and discretionary activities.
  
  
  CONCLUSIONS
  After long-term follow-up, we found no subjective advantages of using a navigation system for patients who undergo TKA though the absolute number of patients was very small. Additional extensive studies are required to validate our result.
authors.affiliation: Department of Orthopaedic Surgery, Hyogo Rehabilitation Centre Center Hospital, 1070 Akebono-cho, Nishi-ku, Kobe, 651-2181, Japan.
authors.forename: Naoki
authors.initials: N
authors.lastname: Nakano
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Kazunari
authors.initials: K
authors.lastname: Ishida
authors.forename: Nobuhiro
authors.initials: N
authors.lastname: Tsumura
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kuroda
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kurosaka
mesh_terms: D000203:Activities of Daily Living; D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008875:Middle Aged; D020370:Osteoarthritis, Knee / Q000601:surgery*; D017060:Patient Satisfaction; D025321:Surgery, Computer-Assisted / Q000379:methods*; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome